/*
 * Copyright (c) 2010, Andrea Palloni
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * - Neither the name of the copyright holder nor the names of its contributors may be used
 * 	  to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package net.palla.biblio.server.dao;

import java.util.List;

import javax.jdo.PersistenceManager;
import javax.jdo.Query;

import net.palla.biblio.server.PersistenceUtils;
import net.palla.biblio.server.entity.CddEntity;

import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;


/**
 * Represents a Dao for the Cdd entities
 * @author andrea
 *
 */
public class CddDao extends BaseDao {

	//public static String ENTITY_CLASS = "Cdd";
	
	public class CddVerifier {

		public void verify(CddEntity cdd) throws Exception {
			if (cdd.getCdd1() == null) throw new Exception("Cdd must have a primary code");
			if (cdd.getCdd1().trim().equals("")) throw new Exception("Cdd must have a primary code");
			if (cdd.getName() == null) throw new Exception("Cdd must have a name");
			if (cdd.getName().trim().equals("")) throw new Exception("Cdd must have a name");
		}
	}
	
	@Override
	protected Object doBeforePost(PersistenceManager pm, Object o) throws Exception {
		if (o.getClass() != CddEntity.class)
			throw new Exception("Class MUST be of type " +CddEntity.class.getName());
		CddEntity cdd = (CddEntity)o;
		CddVerifier v = new CddVerifier();
		v.verify(cdd);//Verifies data Correctness;
		//if key is null it must be provided based on cdd1 and cdd2
		//this is because @Unique annotation does not work
		if (cdd.getId() == null) {
			String k = cdd.getCdd1();
			if (cdd.getCdd2() != null) {
				k += "." + cdd.getCdd2();
			}
			Key key = KeyFactory.createKey(CddEntity.class.getSimpleName(), k);
			cdd.setId(key);
		}
		return cdd;
	}

	@Override
	protected void doBeforeDelete(PersistenceManager pm, Object o) throws Exception {
		return;
		
	}

	@Override
	protected void doAfterDelete(PersistenceManager pm, Object o) throws Exception {
		// TODO Auto-generated method stub
		
	}

	@Override
	protected Object doAfterPost(PersistenceManager pm, Object old, Object n) throws Exception {
		// TODO Auto-generated method stub
		return n;
	}

	/**
	 * Gets list of entities by Cdd
	 * @param cKey
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public List<CddEntity> getByCdd(String cdd1, String cdd2) {
		PersistenceManager pm = PersistenceUtils.get().getPersistenceManager();
		Query q = pm.newQuery(CddEntity.class);
		String filter = "key.cdd1 == key1Param && key.cdd2 == key2Param";
		String params = "String key1Param, String key2Param";
    	q.setFilter(filter);
    	q.declareParameters(params);
    	List<CddEntity> cdds = null;
    	try {
      		cdds = (List<CddEntity>) q.execute(cdd1, cdd2);
    		cdds.size();//fix the bug
    	} finally {
    		q.closeAll();
    		pm.close();
    	}
    	return cdds;    	
	}

	/**
	 * Gets a List of entities by Parent Key
	 * @param key
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public List<CddEntity> getByParent(Key key) {
		PersistenceManager pm = PersistenceUtils.get().getPersistenceManager();
		Query q = pm.newQuery(CddEntity.class);
		String filter = "parent == parentParam";
		String params = "com.google.appengine.api.datastore.Key parentParam";
    	q.setFilter(filter);
    	q.declareParameters(params);
    	List<CddEntity> cdds = null;
    	try {
      		cdds = (List<CddEntity>) q.execute(key);
    		cdds.size();//fix the bug
    	} finally {
    		q.closeAll();
    		pm.close();
    	}
    	return cdds;    	
	}
	
}
